- make memory streams header-only (simpler)
- add sub-views and direct seek for span streams
New IOobject convenience methods
- IOobject::instanceValue() : return the IOobject instance as a scalar
value (or 0). Effectively the same as instant(io.instance()).value()
but with far less typing.
- IOobject::fileModificationChecking_masterOnly() : combines checks for
time-stamp and inotify variants
STYLE: minor adjustments for Enum
